Joint use of probabilistic signal shaping and forward error correction
US10091046B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 20, 2017 |
| Grant date | Oct 2, 2018 |
| Priority date | — |
| Expiry date | Nov 20, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/0058
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A communication system in which probabilistic signal shaping and FEC coding are jointly used in an efficient manner that enables, e.g., the use of relatively high modulation orders without a penalizing increase of the FEC-code rate. In an example embodiment, the amplitudes of transmitted constellation symbols are generated using a shaping encoder. Some transmitted constellation symbols carry, as sign bits, the parity-bit values generated by an FEC encoder configured to operate on (i) a subset of bits from the binary labels of the shaped amplitudes and (ii) an additional set of unshaped information bits. Some other transmitted constellation symbols carry, as sign bits, the bit values of the additional set of unshaped information bits. In some embodiments the used FEC code can be a low-density parity-check code. Some embodiments can be used in communication systems relying on discrete multi-tone modulation, such as the systems providing DSL access over subscriber lines.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.